CN1971704A - Lvds and tmds dualfunction device - Google Patents
Lvds and tmds dualfunction device Download PDFInfo
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- CN1971704A CN1971704A CNA200610143542XA CN200610143542A CN1971704A CN 1971704 A CN1971704 A CN 1971704A CN A200610143542X A CNA200610143542X A CN A200610143542XA CN 200610143542 A CN200610143542 A CN 200610143542A CN 1971704 A CN1971704 A CN 1971704A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
Abstract
A LVDS and TMDS dualfunction transmitter for both LVDS and TMDS output channels is disclosed, including an encoder and a serializer. The encoder encodes twenty eight bits of LVDS signals to thirty bits of TMDS signals. The serializer includes four serializer channels for converting the LVDS signals to a serial signal when a LVDS mode is enabled, or converting the TMDS signals to the serial signal when a TMDS mode is enabled. Wherein a first serializer channel is coupled to seven bits of the LVDS signals and outputting a first pair of differential signals. Second, third and fourth serializer channel are coupled to seven bits of the LVDS signals and ten bits of TMDS signals, and outputting a second, third and fourth pair of differential signals, respectively.
Description
Technical field
The invention relates to the difunctional transmitter of a kind of low-voltage differential signal and transition-minimized differential wave, and be particularly to have the low-voltage differential signal of one group of output signal pin position and the difunctional transmitter of transition-minimized differential wave, and utilize serializer to couple inner low-voltage differential signal and transition-minimized differential wave.
Background technology
Low-voltage differential signal (low voltage differential signaling; LVDS) and transition-minimized differential wave (transition minimized differential signaling; TMDS) be two kinds of main interfaces of flat display apparatus.Fig. 1 is difunctional transmitter 10 calcspars that show known low-pressure differential wave/transition-minimized differential wave, comprising: 28 low-voltage differential signals (be signal RED (0:7), GREEN (0:7), BLUE (0:7), HSYNC, VSYNC, DE, reach D23Y (not being shown in Fig. 1)), scrambler 12 are in order to be encoded to 28 low-voltage differential signals 30 transition-minimized differential waves, low-voltage differential signal serializer 11, transition-minimized differential wave serializer 13, low-voltage differential signal driver 14, to reach transition-minimized differential signal driver 15.
In the low-voltage differential signal pattern, this transmitter 10 is sent to 4 data channels 0～3 of low-voltage differential signal serializer 11 with these 28 low-voltage differential signals.In transition-minimized differential wave pattern, this transmitter 10 at first is sent to scrambler 12 with these 28 low-voltage differential signals, 30 signals after then will encoding are divided into 3 group data streams (10), to be sent to 3 data channels 1～3 of transition-minimized differential wave serializer 13.
Low-voltage differential signal driver 14 and transition-minimized differential signal driver 15 are respectively coupled to low-voltage differential signal serializer 11 and transition-minimized differential wave serializer 13, to drive low-voltage differential signal and the required differential wave end of transition-minimized differential wave output interface.Each data channel couples mutually after this low-voltage differential signal driver 14 and this transition-minimized differential signal driver 15, except data channel 0 this paths of low-voltage differential signal serializer 11.At last, data are via YTX0, YTX1, YTX2, YTX3, and these several groups of differential wave ends outputs of YTXC (clock passage).Wherein this only activation when the low-voltage differential signal pattern of group differential wave end of data channel 0 and YTX0.
This low-voltage differential signal serializer 11 and transition-minimized differential wave serializer 13 are utilized and are changeed serial line unit side by side with the series connectionization data.Fig. 2 shows low-voltage differential signal serializer channel 200 calcspars that comprise 7 unit 201 to 207.Each unit receives a data-signal and two phase place signal.In this embodiment, in each clock period, 14 phase signals transmit 14 groups of phase places respectively, wherein, per 2 groups of phase places are sent to a unit, with the part of output serial bit stream.Then, in each clock period, in this low-voltage differential signal channel, produce 7 bit data streams.Fig. 3 A and 3B show transition-minimized differential wave serializer channel 300 calcspars that comprise 10 unit 301～310.Each unit receives data-signal and phase signal.In this embodiment, in each clock period, 10 phase signals transmit 10 groups of phase places respectively, wherein, every group of phase place are sent to a unit, with the part of output serial bit stream.Then, in each clock period, in this transition-minimized differential wave channel, produce 10 bit data streams.
When directly in conjunction with low-voltage differential signal and transition-minimized differential wave drive unit, because therefore serialization path separately needs bigger layout area.When realizing low-voltage differential signal and transition-minimized differential wave drive unit respectively, relatively then sacrificed elasticity.
Summary of the invention
The invention provides the difunctional transmitter of a kind of low-voltage differential signal and transition-minimized differential wave, utilize unitary series of operations device interface as low-voltage differential signal and both delivery channels of transition-minimized differential wave, this transmitter comprises scrambler and serializer.This scrambler is in order to be encoded to 30 transition-minimized differential waves with 28 low-voltage differential signals.This serializer comprises four serializer passages, when the activation of low-voltage differential signal pattern, in order to this low-voltage differential signal is converted to serial signal, perhaps, when the activation of transition-minimized differential wave pattern, in order to this transition-minimized differential wave is converted to this serial signal.Wherein, the first serializer channel couples 7 low-voltage differential signals, and exports first group of differential wave.Second, third, and the 4th serializer channel couple 7 low-voltage differential signals and 10 transition-minimized differential waves respectively, and export respectively second, third, and the 4th group of differential wave.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, embodiment cited below particularly, and cooperate appended diagram, be described in detail as follows.
Description of drawings
Fig. 1 is the difunctional transmitter calcspar that shows known low-pressure differential wave/transition-minimized differential wave;
Fig. 2 shows the low-voltage differential signal serializer channel calcspar that comprises 7 unit;
Fig. 3 A and 3B show the transition-minimized differential wave serializer channel calcspar that comprises 10 unit;
Fig. 4 is the difunctional transmitter calcspar that shows according to the low-voltage differential signal/transition-minimized differential wave of the embodiment of the invention; And
Fig. 5 A-5C be this difunctional serializer 41 of displayed map 4 when carrying out the normal serialization of low-voltage differential signal and transition-minimized differential wave, the calcspar of difunctional serializer data channel 50.
[main element label declaration]
40～transmitter;
41～difunctional serializer;
42～scrambler;
44～difunctional driver.
Embodiment
The present invention provides a kind of brand-new framework for the difunctional transmitter of low-voltage differential signal and transition-minimized differential wave.Fig. 4 is difunctional transmitter 40 calcspars that show according to the low-voltage differential signal/transition-minimized differential wave of the embodiment of the invention.Transmitter 40 comprises: 28 first signal (be low-voltage differential signal, comprise signal RED (0:7), GREEN (0:7), BLUE (0:7), HSYNC, VSYNC, DE, reach D23Y (not being shown in Fig. 4)), scrambler 42 are in order to be 30 secondary signal (being the transition-minimized differential wave), difunctional serializer 41 with this first signal encoding, to reach difunctional driver 44.
In this embodiment, difunctional serializer 41 is shared by low-voltage differential signal and transition-minimized differential wave two interfaces.In the low-voltage differential signal pattern, this first signal directly is sent to difunctional serializer 41.In transition-minimized differential wave pattern, at first this first signal is sent to scrambler 42, to produce 30 secondary signal, be resent to difunctional serializer 41.Difunctional driver 44 is coupled to difunctional serializer 41, to drive low-voltage differential signal and the required differential wave group of transition-minimized differential wave output interface.
These difunctional serializer 41 definition 4 data channels (data channel 1～4), wherein data channel 1 (being connected to YTX0 differential wave end) only is used for the low-voltage differential signal transmission, and other data channel 2～4 is then carried out the normal serialization of low-voltage differential signal and transition-minimized differential signal interface.This difunctional serializer 41 is when the low-voltage differential signal pattern, each data channel is to the differential wave end with 7 the first signal series connectionization, and when transition-minimized differential wave pattern, only data channel 2～4 with 10 secondary signal series connectionization to the differential wave end.The data channel 1 of difunctional serializer 41 can be realized as the serializer passage 200 of Fig. 2.In this embodiment, the data channel 1 of difunctional serializer 41 couples this first signal of 7, in order to export only first group of required differential wave of low-voltage differential signal interface.The channel 2～4 of difunctional serializer 41 couples this first signal of 7 and this secondary signal of 10 respectively, to export second, third respectively, to reach the 4th group of differential wave.
Fig. 5 A-5C, this difunctional serializer 41 that is displayed map 4 when carrying out the normal serialization of low-voltage differential signal and transition-minimized differential wave, the calcspar of difunctional serializer data channel 50.Difunctional serializer data channel 50 comprises: multiplexer 51, data selector 52, and phase selector 53.This data selector 52 is according to selecting signal SELECT, select 2 groups of input signals one of them, to export this multiplexer 51 to, wherein, above-mentioned 2 groups of input signals wherein one group of signal comprise first signal of 3 ground signallings and 7 LCD0～LCD6, and another group signal comprises the secondary signal of 10 TCD0～TCD9.This phase selector 53 is selected signal SELECT according to this, also between 2 groups of phase signals, select, to export this multiplexer 51 to, wherein, above-mentioned 2 groups of phase signals wherein one group of signal comprise phase signal PHS_L＜0 of 6 ground signallings and 14 low-voltage differential signals 〉～PHS_L＜13 〉, another group signal then comprises 10 phase signal PHS_T＜0 of duplicating this transition-minimized differential wave 〉～PHS_T＜9〉be 2 groups of signals.
In the low-voltage differential signal pattern, this multiplexer 51 receives first signal of 3 ground signallings and 7 LCD0～LCD6 according to selection signal SELECT by data-signal end D0～D9, and is received phase signal PHS_L＜0 of 6 ground signallings and 14 low-voltage differential signals by phase signal end PHS0～PHS19 〉～PHS_L＜13 〉.Wherein, in the low-voltage differential signal pattern, this multiplexer 51 only 5102～5108 these 7 unit is effective.The phase signal of 2 low-voltage differential signals is sent to a unit, with the part of output serial bit stream.Then, in each clock period, export 7 bit data streams to this serial signal CSD.
In transition-minimized differential wave pattern, this multiplexer 51 is according to selecting signal SELECT to receive the secondary signal TCD0～TCD9 of 10 transition-minimized differential waves by data-signal end D0～D9, and receives 10 phase signal PHS_T＜0 from this transition-minimized differential wave by phase signal end PHS0～PHS19 〉～PHS_T＜9〉2 groups of signals being duplicated.The unit select these 2 groups of transition-minimized differential waves phase signal one of them, with output serial bit stream a part.Then, in each clock period, export 10 bit data streams to this serial signal CSD.
By realizing embodiments of the invention, can reach than the also little compact design of the shared layout area of known framework.Estimate that the layout area of being saved is equivalent to the transition-minimized differential signal transmitter approximately.The difunctional serializer that should share also allow general impact damper and driver, by normal route to transmit data arranged side by side.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (4)
1. the difunctional transmitter of low-voltage differential signal and transition-minimized differential wave comprises:
Scrambler is in order to be encoded to 30 transition-minimized differential waves with 28 low-voltage differential signals; And
Difunctional serializer comprises four serializer passages, when the activation of low-voltage differential signal pattern, in order to this low-voltage differential signal is converted to serial signal, perhaps, when the activation of transition-minimized differential wave pattern, in order to this transition-minimized differential wave is converted to this serial signal;
Wherein, the first serializer channel couples 7 low-voltage differential signals, and exports first group of differential wave; And
Second, third, and the 4th serializer channel couple 7 low-voltage differential signals and 10 transition-minimized differential waves, and export respectively second, third, and the 4th group of differential wave.
2. the difunctional transmitter of low-voltage differential signal according to claim 1 and transition-minimized differential wave, wherein, this second, third, and each serializer passage of the 4th comprise:
Multiplexer, when this low-voltage differential signal pattern activation, in order to these 7 low-voltage differential signals are converted to this serial signal, and when this transition-minimized differential wave pattern activation, in order to these 10 transition-minimized differential waves are converted to this serial signal;
Wherein, this multiplexer comprises 10 unit, and each unit has input end and output terminal, and it couples this serial signal, and receives first and second phase signal.
3. the difunctional transmitter of low-voltage differential signal according to claim 2 and transition-minimized differential wave, wherein, when this low-voltage differential signal pattern activation:
Have input end and couple 7 unit of this low-voltage differential signal, receive effectively first and second phase signal, and have other 3 unit that input end couples ground voltage, receive first and second invalid phase signal.
4. the difunctional transmitter of low-voltage differential signal according to claim 2 and transition-minimized differential wave, wherein, when this transition-minimized differential wave pattern activation:
Have input end and couple 10 unit of this transition-minimized differential wave, receive effectively first and second phase signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US73563905P | 2005-11-10 | 2005-11-10 | |
| US60/735,639 | 2005-11-10 | ||
| US11/537,682 | 2006-10-02 |
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| Publication Number | Publication Date |
|---|---|
| CN1971704A true CN1971704A (en) | 2007-05-30 |
| CN100468516C CN100468516C (en) | 2009-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610143542XA Active CN100468516C (en) | 2005-11-10 | 2006-11-10 | Lvds and tmds dualfunction device |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7358873B2 (en) |
| CN (1) | CN100468516C (en) |
| TW (1) | TWI316788B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8179984B2 (en) | 2008-11-12 | 2012-05-15 | Mediatek Inc. | Multifunctional transmitters |
| CN102819999A (en) * | 2009-10-27 | 2012-12-12 | 联发科技股份有限公司 | Multifunctional transmitter and data transmission method |
| US8416005B2 (en) | 2008-01-03 | 2013-04-09 | Mediatek Inc. | Multifunctional output drivers and multifunctional transmitters using the same |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7394406B2 (en) * | 2002-12-17 | 2008-07-01 | Broadcom Corporation | Method and system for generating high definition multimedia interface (HDMI) codewords using a TMDS encoder/decoder |
| US20090168905A1 (en) * | 2007-12-28 | 2009-07-02 | Teradyne, Inc. | Decoding of LVDS Protocols |
| US8072437B2 (en) * | 2009-08-26 | 2011-12-06 | Global Oled Technology Llc | Flexible multitouch electroluminescent display |
| CN103347161B (en) * | 2013-06-25 | 2016-05-25 | 龙迅半导体（合肥）股份有限公司 | Parallel digital signal is converted to method and the device of serial TMDS signal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6847335B1 (en) * | 1998-10-29 | 2005-01-25 | Ati International Srl | Serial communication circuit with display detector interface bypass circuit |
| US7253663B2 (en) * | 2005-06-15 | 2007-08-07 | Ati Technologies Inc. | Apparatus and methods for self-biasing differential signaling circuitry having multimode output configurations for low voltage applications |
-
2006
- 2006-10-02 US US11/537,682 patent/US7358873B2/en active Active
- 2006-11-10 CN CNB200610143542XA patent/CN100468516C/en active Active
- 2006-11-10 TW TW095141652A patent/TWI316788B/en active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8416005B2 (en) | 2008-01-03 | 2013-04-09 | Mediatek Inc. | Multifunctional output drivers and multifunctional transmitters using the same |
| US8179984B2 (en) | 2008-11-12 | 2012-05-15 | Mediatek Inc. | Multifunctional transmitters |
| CN101739997B (en) * | 2008-11-12 | 2012-09-19 | 联发科技股份有限公司 | Multifunctional transmitter and data transmitting method |
| CN102819999A (en) * | 2009-10-27 | 2012-12-12 | 联发科技股份有限公司 | Multifunctional transmitter and data transmission method |
Also Published As
| Publication number | Publication date |
|---|---|
| US20070103349A1 (en) | 2007-05-10 |
| CN100468516C (en) | 2009-03-11 |
| TWI316788B (en) | 2009-11-01 |
| US7358873B2 (en) | 2008-04-15 |
| TW200719593A (en) | 2007-05-16 |
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